Trivia
Bulkley and Bulkeley (who are brothers but use different spellings of their last name) developed their script from media accounts and police reports.
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Some of the music used in this version of The Zodiac is used in Terminator 2: Judgment Day.
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The script calls the location of the first murders Lake Helena Road. It was actually Lake Herman Road which crosses from Vallejo to Benica next to Lake Herman.
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Many of the neighborhood scenes were filmed on location in the St. Basil neighborhood of Vallejo.
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Mare Island refers to an island which is part of Vallejo. It is said to be names after a prized white mare owned by Gen. Mariano Guadalupe Vallejo. On an occasion when a number of the General's horses were being ferried across the Strait from the Contra Costa shore to Benicia, the crude barge capsized. Some of the horses swam ashore, others drowned, and the white mare disappeared. It is recorded that many weeks afterward, the white mare was discovered grazing on the hillside of the island across the channel from Vallejo. From that day, the island was known as "Mare's Island," shortened to Mare Island.
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Mare Island was a naval base from 1853 to 1996 primarily focused on naval ship construction. The first prototype aircraft carrier was built there as well as the first nuclear powered submarine built on the west coast.
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The burning of Kathleen Johns' car can be seen in the music video intro played before the attack at the lake.
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